A Study of Ductility Reduction Factors Formula of Capacity Spectrum Method for Evaluating Seismic Performance of Bridge Structures

교량구조물의 내진성능평가를 위한 역량스펙트럼 방법의 연성도 감소계수 산정식에 관한 연구

The main objective of this study was to derive a formula of ductility reduction factor, expressed as $R{\mu}$. To attain this objective, a study comprised reduction factors computed for stiffness degrading systems undergoing different levels of ductility and to investigate an accuracy of the formula. Based on this study, the main conclusions can be summarized :(1) The ductility reduction factor is primarily affected by the period of the system and the displacement ductility ratio. (2) The proposed formula is simpler and the inelastic deformations of bridge structures are better than those by the others formulas we used before.